论文标题
通过$ z $衰减的近级领先级QCD校正到独家双炭生产
Next-to-leading-order QCD correction to the exclusive double charmonium production via $Z$ decays
论文作者
论文摘要
在本文中，我们通过使用非递归主义QCD因素化方法对双炭的独家生产进行了进一步的研究，其中QED图的单个光子片段化拓扑，QCD和完整QED图之间的干扰术语和QED QED术语之间的干扰术语是extercection-efter-Leading-eorder erress ertive erceptions Interctions interctions Interctions Intercortions Interctions Interctions sistertoncations Intercortions Intercortions Interctions secrettim secrettorct。对于$ z $ -Boson衰减中$ J/ψ+J/ψ$的生产，由于添加了新计算的NLO QCD校正，干扰项显示出显着的现象学效应。将所有贡献添加在一起后，分支分数$ \ MATHCAL {b} _ {z \ to J/ψJ/ψ} $仍然显然可以显然降低了CMS协作数据。此外，我们同时完成了$ z \ to j/ψ+η_c（χ_{CJ}）$的临近订单计算，并使用$ j =（0,1,2）$。计算出的结果表明，新计算的完整QED和跨项将对总衰减宽度有效。
In this paper, we preformed a further research on the exclusive productions of double charmonium via $Z$-boson decay by using nonrelativistic QCD factorizations approach, where the single-photon fragmentation topologies of the QED diagrams, the interference terms between the QCD and full QED diagrams, the next-to-leading-order calculations of the interference terms are preformed. For the production of $J/ψ+J/ψ$ in $Z$-boson decay, the interference terms show a significantly phenomenological effect due to the addition of the newly calculated NLO QCD corrections. After adding together all contributions, the branching fraction $\mathcal{B}_{Z\to J/ψJ/ψ}$ still undershoots the CMS collaboration data obviously. In addition, we simultaneously complete the next-to-leading-order calculations for $Z\to J/ψ+η_c (χ_{cJ})$ with $J=(0,1,2)$. The calculated results show that the newly-calculated complete QED and cross terms will have obvious effective on the total decay widths.
